[1]
[CITE[Emacs VietThai environment]] <http://www.m17n.org/vietthai/forEmacs.html>

> As the proposal for VietThai script to the Unicode is still in progress, we use the Private Use Area for VietThai characters (U+F000..U+F07E). A VietThai font encoded accordingly is also available in the package.

[2] [CITE[Special filenames]]
( ([TIME[2011-03-01 18:26:29 +09:00]] 版))
<http://www.cygwin.com/cygwin-ug-net/using-specialnames.html>

[3] [CITE@en[Private Use (Unicode) - Wikipedia, the free encyclopedia]]
( ([TIME[2012-03-04 20:44:51 +09:00]] 版))
<http://en.wikipedia.org/wiki/Private_Use_(Unicode)#Example_code_point_U.2BF8FF>

[4] [CITE@en[Bug 16862 – Indexes: GB18030 and Microsoft encodings should support PUA code points]]
( ([TIME[2013-10-27 03:50:39 +09:00]] 版))
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=16862>